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S-Methyl-L-cysteine

S-Methyl-L-cysteine Structure
S-Methyl-L-cysteine structure
CAS No.
1187-84-4
Chemical Name:
S-Methyl-L-cysteine
Synonyms
Methylcysteine;SMC;H-CYS(ME)-OH;S-METHYL-CYSTEINE;SMLC;L-Cys（me）-OH;H-L-CYS(ME)-OH;S-Methyl-L-Cys-OH;S-METHYL-L-CYSTEINE;S-MethyI-L-cysteine
CBNumber:
CB4154282
Molecular Formula:
C4H9NO2S
Molecular Weight:
135.18
MDL Number:
MFCD00002612
MOL File:
1187-84-4.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-05-28 02:35:56
Product description Number Pack Size Price
S-Methyl-L-cysteine substrate for methionine sulfoxide reductase A M6626 5g $112
S-Methyl-L-cysteine substrate for methionine sulfoxide reductase A M6626 25g $452
S-Methyl-L-cysteine >98.0%(T) M0233 5g $109
S-methyl-L-Cysteine ≥95% 33452 1g $41
S-methyl-L-Cysteine ≥95% 33452 5g $75
More product size
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S-Methyl-L-cysteine Properties

Melting point ~240 °C (dec.)
alpha -29.5 º (c=1,water)
Boiling point 300.3±37.0 °C(Predicted)
Density 1.149 (estimate)
refractive index -30 ° (C=2, H2O)
storage temp. Keep in dark place,Sealed in dry,Store in freezer, under -20°C
solubility Aqueous Acid (Slightly, Sonicated), Aqueous Base (Sparingly, Sonicated)
form Solid
pka pK1:8.97 (25°C)
color White to Off-White
BRN 1721675
Major Application peptide synthesis
InChI InChI=1S/C4H9NO2S/c1-8-2-3(5)4(6)7/h3H,2,5H2,1H3,(H,6,7)/t3-/m0/s1
InChIKey IDIDJDIHTAOVLG-VKHMYHEASA-N
SMILES C(O)(=O)[C@H](CSC)N
LogP 0.380 (est)
CAS DataBase Reference 1187-84-4(CAS DataBase Reference)
EWG's Food Scores 1
FDA UNII A34I1H07YM
NIST Chemistry Reference s-Methyl-L-cysteine(1187-84-4)
UNSPSC Code 12352209
NACRES NA.26

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H315-H335-H319-H302
Precautionary statements  P264-P270-P301+P312-P330-P501-P264-P280-P302+P352-P321-P332+P313-P362-P264-P280-P305+P351+P338-P337+P313P
PPE Eyeshields, Gloves, type N95 (US)
Hazard Codes  Xn
Risk Statements  22
Safety Statements  22-24/25-36/37/39-26
WGK Germany  3
HS Code  29309090
Storage Class 11 - Combustible Solids
NFPA 704
0
1 0

S-Methyl-L-cysteine price More Price(64)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich M6626 S-Methyl-L-cysteine substrate for methionine sulfoxide reductase A 1187-84-4 5g $112 2026-04-30 Buy
Sigma-Aldrich M6626 S-Methyl-L-cysteine substrate for methionine sulfoxide reductase A 1187-84-4 25g $452 2026-04-30 Buy
TCI Chemical M0233 S-Methyl-L-cysteine >98.0%(T) 1187-84-4 5g $109 2026-04-30 Buy
Cayman Chemical 33452 S-methyl-L-Cysteine ≥95% 1187-84-4 1g $41 2026-04-30 Buy
Cayman Chemical 33452 S-methyl-L-Cysteine ≥95% 1187-84-4 5g $75 2026-04-30 Buy
Product number Packaging Price Buy
M6626 5g $112 Buy
M6626 25g $452 Buy
M0233 5g $109 Buy
33452 1g $41 Buy
33452 5g $75 Buy

S-Methyl-L-cysteine Chemical Properties,Uses,Production

Chemical Properties

white to light beige fine crystalline powder

Uses

S-Methyl-L-cysteine is a substrate in the catalytic antioxidant system mediated by methionine sulfoxide reductase A (MSRA). It has been studied as a theurapeutic for neurodegenerative diseases including Parkinson′s.

Definition

ChEBI: A cysteine derivative that is L-cysteine in which the hydrogen attached to the sulfur is replaced by a methyl group.

Biological Activity

S-Methyl-L-cysteine (SMLC) is a substrate in the catalytic antioxidant system mediated by methionine sulfoxide reductase A (MSRA). SMLC is naturally present in garlic, cabbage, and turnips and has been studied as a theurapeutic for neurodegenerative diseases including Parkinsonμs.
When used as a dietary supplement in the Drosphilia model of PD, SMLC increases the efficacy of the MRSA catalytic antioxidant system by providing additional substrate available leading to increased resistance to oxidative stress.

Purification Methods

Likely impurities are cysteine and S-methyl-dl-cysteine. Crystallise it from H2O by adding 4volumes of EtOH. It also crystallises from MeOH with m 234-236o(dec), but after sublimation i t has m 267-270o and [] 27D -31.6o (c 1, H2O). [Rinderknecht et al. Helv Chim Acta 41 1, 10 1958, Theodoropoulos Acta Chem Scand 13 383 1959, Greenstein & Winitz The Chemistry of the Amino Acids J. Wiley, Vol 3 p 1904 1961, Beilstein 4 IV 3145.]

S-Methyl-L-cysteine Preparation Products And Raw materials

Raw materials

Preparation Products

L-Alanine, 3-(methylsulfonyl)- methyl S-methyl-L-cysteinate(SALTDATA: HCl)

S-Methyl-L-cysteine Suppliers

Global( 251)Suppliers
Supplier Tel Email Country ProdList Advantage
ZHENGZHOU JIUYI TIME NEW MATERIALS CO,.LTD 		+86-13017695106 +86-13676922317 jiuyitime@fdachem.com China 16512 58
Henan Tianfu Chemical Co.,Ltd. 		+86-0371-55170693 +86-19937530512 info@tianfuchem.com China 21586 55
GenicBio Limited 		+86-21-37621270 service@genicbio.com CHINA 991 58
career henan chemical co 		+86-0371-86658258 +8613203830695 sales@coreychem.com China 29815 58
BOC Sciences 		+1-631-485-4226 inquiry@bocsci.com United States 19936 58
Alchem Pharmtech,Inc. 		8485655694 sales@alchempharmtech.com United States 63687 58
CONIER CHEM AND PHARMA LIMITED 		+8618523575427 sales@conier.com China 49979 58
SIMAGCHEM CORP 		+86-5922680277 +86-13806087780 sale@simagchem.com China 17346 58
TargetMol Chemicals Inc. 		+1-781-999-5354; +17819995354 marketing@targetmol.com United States 32466 58
Hefei TNJ Chemical Industry Co.,Ltd. 		+86-0551-65418671 +8618949823763 sales@tnjchem.com China 34563 58
Supplier Advantage
ZHENGZHOU JIUYI TIME NEW MATERIALS CO,.LTD 		58
Henan Tianfu Chemical Co.,Ltd. 		55
GenicBio Limited 		58
career henan chemical co 		58
BOC Sciences 		58
Alchem Pharmtech,Inc. 		58
CONIER CHEM AND PHARMA LIMITED 		58
SIMAGCHEM CORP 		58
TargetMol Chemicals Inc. 		58
Hefei TNJ Chemical Industry Co.,Ltd. 		58

View Lastest Price from S-Methyl-L-cysteine manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
S-Methyl-L-cysteine pictures 2026-04-22 S-Methyl-L-cysteine
1187-84-4
 99.87% 10g TargetMol Chemicals Inc.
S-Methyl-L-cysteine pictures 2026-04-17 S-Methyl-L-cysteine
1187-84-4
 $2.00-5.00 1kg 99% 100kg ZHENGZHOU JIUYI TIME NEW MATERIALS CO,.LTD
S-Methyl-L-cysteine pictures 2019-07-06 S-Methyl-L-cysteine
1187-84-4
 $1.00 1 mg 99% 100KG Career Henan Chemical Co

S-Methyl-L-cysteine Spectrum

S-Methyl-L-cysteine(1187-84-4)MSS-Methyl-L-cysteine(1187-84-4)1HNMRS-Methyl-L-cysteine(1187-84-4)13CNMRS-Methyl-L-cysteine(1187-84-4)IR1S-Methyl-L-cysteine(1187-84-4)IR2S-Methyl-L-cysteine(1187-84-4)Raman

1187-84-4(S-Methyl-L-cysteine)Related Search:

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S-Trityl-L-cysteine S-Carboxymethyl-L-cysteine L-CYSTEINE HCL ANHYDROUS

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(R)-2-AMINO-3-(METHYLMERCAPTO)PROPIONIC ACID S-METHYL-L-CYSTEINE H-L-CYS(ME)-OH Alanine, 3-(methylthio)-, L- L-CH3SCH2CH(NH2)COOH L-Cysteine, S-methyl- S-Methyl-L-Cysteine(SMC) DL-S-Methyl-cysteine S-Methyl-L-cysteine, 99+% S-Methyl-L-Cys-OH S-METHYL-L-CYSTEINE/ H-CYS(ME)-OH (2R)-2-Amino-3-methylsulfanylpropanoic acid METHYL-L-CYSTEINE, S-(RG) DL-S-Methyl- Cys-OH DL-S-Methyl-cysteine S-Methyl-L-cysteine, 99+% 10GR S-Methyl-L-cysteine substrate for Methionine sulfoxide reductase A SMLC (2R)-2-ammonio-3-(methylthio)propanoate S-Methyl-L-cysteine> S-MethyI-L-cysteine S-Methyl-L-cysteine USP/EP/BP S-methyl-laevo-cysteine TIANFUCHEM--1187-84-4--S-Methyl-L-cysteine L-Cys（me）-OH S-Methyl-L-cysteine, 10 mM in DMSO S-Methyl-L-cysteine H-CYS(ME)-OH Methylcysteine S-METHYL-CYSTEINE SMC 1187-84-4 CH3SCH2CHNH2CO2H C4H9NO2S Cysteine/Cystine Peptide Synthesis Specialty Synthesis Amino Acid Derivatives Amino Acids Derivatives Cysteine [Cys, C] Amino Acids and Derivatives Amino Acid Derivatives